4) Invite followers to record Instavideo and use related hashtag:
Invite your audience to record and post Instavideo with a hashtag that you specify to enter into a contest, or promote your event, or your new product launching. This trick will expand your new followers and more interactions with existing followers.

5) More Interactions in FB:
Videos and pictures will get more comments, shares and ‘likes’ in FB. Instagram Video can be shared in FB and further on, attract more new audience from FB to be your followers in Instagram.